But conservatives are coming out fighting. Supreme Leader Ali Khamenei's man in the Revolutionary Guards, Ali Saidi, for example, says Mr Rafsanjani has no evidence for his Ayatollah Khomeini claim. "Our disagreements with the US government remain fundamental and deep," he told Neda-ye Enghelab website. Hardliners who oppose President Rouhani's overtures to the West pelted him with a shoe on his return from the UN General Assembly last week, to defiant cries of "Death to America".
And despite the apparent thaw in relations, AP news agency reported this Friday that the master-of-ceremonies led the crowd into the chant at least twice during prayers. It was then repeated several times by a group of worshippers who rallied after the ceremony, burning the American and Israeli flags, as they do almost every week. Iran-watchers are now waiting to see what happens on 4 November, the anniversary of the storming of the US embassy in Tehran, when the slogan usually gets its most prominent annual airing.